Bar code symbol reading system employing EAS-enabling faceplate bezel

ABSTRACT

An apparatus includes the primary components of an EAS system and a hand-supportable and countertop-supportable bar code symbol reading system having a housing with a light transmission window covered by an optically transparent faceplate having outer dimensions closely matched to the light transmission window. About the optically transparent faceplate, a faceplate bezel is mounted embodying a coil of electrically conductive wire having terminals connected to an electrical interface circuit, which is connected to a flexible EAS cable extending from the electrical interface circuit. The flexible EAS cable extends towards electrical drive circuitry associated with the EAS subsystem, for powering the coil during EAS tag deactivation operations controlled by the host computer system.

CROSS-REFERENCE TO PRIORITY APPLICATION

The present application is a continuation of U.S. patent applicationSer. No. 13/017,256 for a Bar Code Symbol Reading System EmployingEAS-Enabling Faceplate Bezel, filed Jan. 31, 2011 (and published Aug. 2,2012 as U.S. Patent Application Publication No. 2012/0193422), now U.S.Pat. No. 8,381,979. Each of the foregoing patent application, patentpublication, and patent is hereby incorporated by reference in itsentirety.

BACKGROUND

1. Field of Disclosure

The present disclosure relates generally to an improved method of andapparatus for equipping hand-supportable bar code symbol reading systemswith electronic article surveillance (EAS) tag deactivationcapabilities.

2. Brief Description of the State of Knowledge in the Art

The use of bar code symbols for product and article identification iswell known in the art. Presently, various types of bar code symbolscanners have been developed for reading bar code symbols at retailpoints of sale (POS).

Also, over the years, electronic article surveillance (EAS) methods havebeen developed to prevent shoplifting in retail stores or pilferage ofbooks from libraries. Special tags are fixed to merchandise or books.These tags are removed or deactivated by the clerks when the item isproperly bought or checked out at a POS station. At the exits of thestore, a detection system sounds an alarm or otherwise alerts the staffwhen it senses “active” tags. For high-value goods that are to bemanipulated by the patrons, wired alarm clips may be used instead oftags.

Currently, several major types of electronic article surveillance (EAS)systems have been developed, namely: magnetic-based EAS systems, alsoknown as magneto-harmonic; acousto-magnetic based EAS systems, alsoknown as magnetostrictive; and radio-frequency based EAS systems.

Magnetic-Based EAS Systems

In magnetic-based EAS systems, the tags are made of a strip of amorphousmetal (metglas) which has a very low magnetic saturation value. Exceptfor permanent tags, this strip is also lined with a strip offerromagnetic material with a moderate coercive field (magnetic“hardness”). Detection is achieved by sensing harmonics and sum ordifference signals generated by the non-linear magnetic response of thematerial under a mixture of low-frequency (in the 10 Hz to 1000 Hzrange) magnetic fields. When the ferromagnetic material is magnetized,it biases the amorphous metal strip into saturation, where it no longerproduces harmonics. Deactivation of these tags is therefore done withmagnetization. Activation requires demagnetization. This type of EASsystem is suitable for items in libraries since the tags can bedeactivated when items are borrowed and re-activated upon return. It isalso suitable for low value goods in retail stores, due to the smallsize and very low cost of the tags.

Acousto-Magnetic Based EAS Systems

These EAS systems are similar to magnetic-based EAS systems, in that thetags are made of two strips of metal, namely: a strip ofmagnetostrictive, ferromagnetic amorphous metal, and a strip of amagnetically semi-hard metallic strip, which is used as a biasing magnet(to increase signal strength) and to allow deactivation. These stripsare not bound together, but are free to oscillate mechanically.Amorphous metals are used in such systems due to their goodmagneto-elastic coupling, which implies that they can efficientlyconvert magnetic energy to mechanical vibrations. The detectors for suchtags emit periodic tonal bursts at about 58 kHz, the same as theresonance frequency of the amorphous strips. This causes the strip tovibrate longitudinally by magnetostriction, and to continue to oscillateafter the burst is over. The vibration causes a change in magnetizationin the amorphous strip, which induces an AC voltage in the receiverantenna. If this signal meets the required parameters (correctfrequency, repetition etc.) the alarm is activated.

When the semi-hard magnet is magnetized, the tag is activated. Themagnetized strip causes the amorphous strip to respond much morestrongly to the detectors, because the DC magnetic field given off bythe strip offsets the magnetic anisotropy within the amorphous metal.The tag can also be deactivated by demagnetizing the strip, making theresponse small enough so that it will not be detected by the detectors.These tags are thicker than magnetic tags and are thus seldom used forbooks. However they are relatively inexpensive and have better detectionrates (fewer false positives and false negatives) than magnetic tags.

Radio-Frequency Based EAS Systems

The Series 304 RF EAS label is essentially an LC tank circuit that has aresonance peak anywhere from 1.75 MHz to 9.5 MHz. The most popularfrequency is 8.2 MHz. Sensing is achieved by sweeping around theresonant frequency and detecting the dip. Deactivation for 8.2 MHz labeltags is achieved by detuning the circuit by partially destroying thecapacitor. This is done by submitting the tag to a strongelectromagnetic field at the resonant frequency which will inducevoltages exceeding the capacitor's breakdown voltage, which isartificially reduced by puncturing the tags.

The Unsolved Problem

Despite numerous advances in EAS systems over the past few decades,enabling conventional bar code symbol readers with EAS capabilities, atthe time of manufacture, as well after purchase during upgradingefforts, has been both a component and labor intensive activity.

Therefore, there still remains a great need in the art for an improvedmethod of and apparatus for enabling hand-supportable andcountertop-supportable bar code symbol reading systems with electronicarticle surveillance (EAS) capabilities, while avoiding the shortcomingsand drawbacks of prior art systems and methodologies.

OBJECTS AND SUMMARY

Accordingly, a primary object of the present disclosure is to provide animproved method of and apparatus for enabling hand-supportable andcountertop-supportable bar code symbol reading systems with electronicarticle surveillance (EAS) capabilities, while avoiding the shortcomingsand drawbacks of prior art systems and methodologies.

Another object of the present invention is to provide such an improvedmethod of and apparatus for incorporating primary components of an EASsystem into hand-supportable and countertop-supportable bar code symbolreading systems.

Another object is to provide such apparatus in the form of ahand-supportable bar digital-imaging bar code symbol reading systemhaving an EAS coil and cable interface circuitry integrated within afaceplate bezel structure that is installed about its imaging window.

Another object is to provide such an apparatus in the form of ahand-supportable laser-scanning bar code symbol reading system having anEAS coil and cable interface circuitry integrated within a faceplatebezel structure that is installed about its scanning window.

Another object is to provide an EAS cable assembly that incorporates oneor more EAS antenna coils embedded into recesses formed within afaceplate bezel that is adapted for easy application about the faceplate(i.e. window) of a hand-supportable or countertop-supportable bar codesymbol reading system.

Another object is to provide a method of incorporating a multi-componentEAS subsystem into a hand-supportable or countertop-supportable bar codesymbol reading system in a part and labor intensive activity.

Another object is to provide a way of reducing the number of parts andassembly steps required to incorporate an EAS subsystem into ahand-supportable or countertop-supportable bar code symbol readingsystem.

Another object is to provide a faceplate bezel adapted for applicationabout the scanning or imaging window of a hand-supportable and/orcountertop-supportable bar code symbol reader, and having a recesswithin which an EAS antenna coil fabricated to specification of a cablevendor, can be embedded and delivered as an EAS subassembly prequalifiedand ready for installation on the bar code symbol deployed in the field.

Another object of the present invention is to provide an EAS assemblythat reduces the number of assembly steps and parts that must bemaintained in inventory.

Another object of the present invention is to provide a prequalified EAScable assembly that incorporates EAS antenna coils (i.e. wire loops)embedded into a finished faceplate bezel that is applied about thescanning or imaging window of a bar code symbol reader at the time ofmanufacture of the bar code symbol reader, and after the bar code symbolreader has been manufactured and deployed in the field.

Another object of the present invention is to provide a faceplate bezelthat is designed to receive any prequalified EAS cable assembly that hasbeen fabricated to specification by a cable vendor, and which can beassembled together as an EAS-enabling faceplate bezel in a singleprocedural step on the assembly line.

Another object of the present invention is to provide an EAS-enablingfaceplate bezel structure that is quickly mounted about imaging orscanning window of a hand-supportable and countertop-supportable barcode symbol reading system, using simple threaded fasteners or othersuitable fastening means.

Another object of the present invention is to provide an EAS-enablingfaceplate bezel and cable assembly that can be used to upgrade anymodular-type hand-supportable and countertop-supportable bar code symbolreading system with EAS functionality in a quick and easy manner,without re-designing the bar code symbol reading system.

Another object is to provide a method of providing a bar code symbolreading system with EAS tag deactivation capabilities.

These and other objects will become apparent hereinafter and in theClaims appended hereto.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more fully understand the Objects, the following DetailedDescription of the Illustrative Embodiments should be read inconjunction with the accompanying Drawings, wherein:

FIG. 1 is a perspective view of an illustrative embodiment of ahand-supportable/countertop-supportable digital-imaging based bar codesymbol reading system incorporating an EAS subsystem within a faceplatebezel structure installed about its imaging window, and shown beingoperated in its automatically-triggered counter-top supported mode ofbar code symbol reading operation;

FIG. 2A is a first perspective exploded view of the digital-imagingbased bar code symbol reading system of the illustrative embodimentdepicted in FIG. 1, showing its printed circuit (PC) board assemblyarranged between the front and rear portions of the system housing, withthe hinged base being pivotally connected to the rear portion of thesystem housing by way of an axle structure;

FIG. 2B is a second perspective/exploded view of the digital-imagingbased bar code symbol reading system of the illustrative embodimentshown in FIG. 1;

FIG. 3 is a plan view of the rear side of a first illustrativeembodiment of the EAS-enabling bezel faceplate incorporating componentsof the EAS subsystem, and shown removed from its digital-imaging basedbar code symbol reading system of FIG. 1;

FIG. 4A is a schematic block diagram describing the major systemcomponents of the digital-imaging based bar code symbol reading systemillustrated in FIGS. 1 through 3;

FIG. 4B is a schematic block diagram of the digital-imaging based barcode symbol reading system of FIG. 1, showing the 3D imaging volume and3D EAS field(s) supported by the system when equipped with theEAS-enabling bezel faceplate of FIG. 3, installed about its imagingwindow;

FIG. 5 is a perspective view of the digital-imaging based bar codesymbol reading system of FIG. 1, shown operated in itsmanually-triggered hand-supported mode of operation;

FIG. 6A is a perspective view of a laser-scanning bar code symbolreading system supporting an ultra-thin EAS-enabling bezel faceplaterealized as a flexible printed circuit, and applied about the laserscanning window (i.e. faceplate) of the system;

FIG. 6B is a perspective view of the EAS-enabling bezel faceplate of thesecond illustrative embodiment shown in FIG. 7, shown being applied tothe front surface of the laser-scanning bar code symbol reading systemas shown in FIG. 6A;

FIG. 7 is a perspective view of the rear surface of the secondillustrative embodiment of the EAS-enabling bezel faceplate shown inFIGS. 6A and 6B, and supporting the realization of deactivation anddetection coils and a cable interface circuit, realized on its flexibleprinted circuit (PC) substrate, molded to the front surface counter ofthe system housing about its laser scanning window; and

FIG. 8 is a schematic block diagram describing the major systemcomponents of the laser-scanning based bar code symbol reading systemillustrated in FIGS. 6A through 7.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

Referring to the figures in the accompanying Drawings, the variousillustrative embodiments of the apparatus and methodologies will bedescribed in great detail, wherein like elements will be indicated usinglike reference numerals.

In general, the EAS-enabling faceplate bezels can be mounted on bar codesymbol reading systems of various designs. For purposes of illustration,FIGS. 1 through 3 show a first illustrative embodiment of anEAS-enabling faceplate bezel mounted about the imaging window of adigital-imaging bar code symbol reading system. FIGS. 6A through 7 showa second illustrative embodiment of an EAS-enabling faceplate bezelmounted about the scanning window of a laser scanning bar code symbolreading system. These illustrative embodiments will now be described ingreater technical detail.

First Illustrative Embodiment of the EAS-Enabled Bar Code Symbol ReadingSystem

Referring now to FIGS. 1 through 3, a first illustrative embodiment ofan EAS-enabling digital-imaging bar code symbol reading system 1 will bedescribed in detail.

As shown in FIGS. 1, 2A and 2B, the digital-imaging bar code symbolreading system 1 comprises: a hand-supportable housing 2 having (i) afront housing portion 2B with a window aperture 6 and an imaging windowpanel 3 installed therein; and (ii) a rear housing portion 2A. As shown,a single PC board based optical bench 8 (having optical subassembliesmounted thereon) is supported between the front and rear housingportions 2A and 3B which, when brought together, form an assembled unit.A base portion 4 is connected to the assembled unit by way of a pivotaxle structure 31 that passes through the bottom portion of the imagerhousing and the base portion so that the hand-supportable housing andbase portion are able to rotate relative to each other. The plug portion57 of the host/imager interface cable 10 passes through a port 32 formedin the rear of the rear housing portion, and interfaces with connector75 mounted on the PC board 8. Also, shown in FIG. 1, flexible EAS cable402 is connected to interface cable 10 using clips or like fasteners allthe way to the EAS module 404, and EAS cable 403 interfacing the EASmodule 404 and the host computer 91 at the POS station.

In FIG. 1, the digital-imaging based system 1 is shown being used in ahands-free, countertop-supportable mode of automatically-activatedoperation, whereas in FIG. 5, the digital-imaging based system 1 isshown being used in a hand-supported manually triggered mode ofoperation. It is understood, however, that the system also supports ahand-supportable automatically-activated mode of operation, as well.

As shown in FIGS. 4A and 4B, the digital-imaging based code symbolreading system 1 comprises a number of subsystem components, namely: animage formation and detection (i.e. camera) subsystem 21 having imageformation (camera) optics 34 for producing a field of view (FOV) upon anobject to be imaged and a CMOS or like area-type image detection array35 for detecting imaged light reflected off the object duringillumination operations in an image capture mode in which at least aplurality of rows of pixels on the image detection array are enabled; aLED-based illumination subsystem 22 employing an LED illumination array32 for producing a field of narrow-band wide-area illumination 26 withinthe entire FOV 33 of the image formation and detection subsystem 21,which is reflected from the illuminated object and transmitted through anarrow-band transmission-type optical filter 40 realized within thehand-supportable and detected by the image detection array 35, while allother components of ambient light are substantially rejected; an objecttargeting illumination subsystem 31 for generating a narrow-areatargeting illumination beam into the FOV, as show in FIG. 5, to helpallow the user to align bar code symbols within the active portion ofthe FOV where imaging occurs; an IR-based object motion detection andanalysis subsystem 20 for producing an IR-based object detection field32 within the FOV of the image formation and detection subsystem 21; anautomatic light exposure measurement and illumination control subsystem24 for controlling the operation of the LED-based illumination subsystem22; an image capturing and buffering subsystem 25 for capturing andbuffering 2-D images detected by the image formation and detectionsubsystem 21; a digital image processing subsystem 26 for processing 2Ddigital images captured and buffered by the image capturing andbuffering subsystem 25 and reading 1D and/or 2D bar code symbolsrepresented therein; and an input/output subsystem 27 for outputtingprocessed image data and the like to an external host system or otherinformation receiving or responding device; a system memory 29 forstoring data implementing a configuration table 29A of systemconfiguration parameters (SCPs); a retail RDBMS server 333 interfacedwith a transceiver, for supporting POS product pricing and related POSservices at the host computing system to which the bar code symbolreading system is interfaced; an electronic article surveillance (EAS)subsystem 28 for generating an EAS tag deactivation field and an EAS tagdetection field, under the supervision of control subsystem 30; and anEAS-enabling faceplate bezel 400 embodying the primary subcomponents ofthe EAS subsystem 28 (e.g. antenna coils 28A, 28D and cable interfacecircuit 28F), and allowing a flexible EAS cable 402 to pass beneath thesystem and piggy-back onto the scanner cable assembly provided in thelower rear portion of the bar code symbol reader, and interface with EASmodule 404, as shown in FIG. 4B.

The primary function of the object targeting subsystem 31 is toautomatically generate and project visible linear-targeting illuminationbeam across the central extent of the FOV of the system in response toeither (i) the automatic detection of an object during hand-held imagingmodes of system operation, or (ii) manual detection of an object by anoperator when s/he manually actuates the manually-actuatable triggerswitch 5A. In order to implement the object targeting subsystem 31, theOCS assembly 78 also comprises a fourth support structure for supportingthe pair of beam folding mirrors above a pair of aperture slots, whichin turn are disposed above a pair of visible LEDs arranged on oppositesites of the FOV optics 34 so as to generate a linear visible targetingbeam 70 that is projected off the second FOV folding 75 and out theimaging window 3, as shown and described in detail in US PatentPublication No. US20080314985 A1, incorporated herein by reference inits entirety.

The primary function of the object motion detection and analysissubsystem 20 is to automatically produce an object detection field 32within the FOV 33 of the image formation and detection subsystem 21, todetect the presence of an object within predetermined regions of theobject detection field 32, as well as motion and velocity informationabout objects therewithin, and to generate control signals which aresupplied to the system control subsystem 30 for indicating when andwhere an object is detected within the object detection field of thesystem. As shown in FIG. 2B, IR LED 90A and IR photodiode 90B aresupported in the central lower portion of the optically-opaque structure133, below the linear array of LEDs 23. The IR LED 90A and IR photodiode90B are used to implement the object motion detection subsystem 20.

The image formation and detection subsystem 21 includes image formation(camera) optics 34 for providing a field of view (FOV) 33 upon an objectto be imaged and a CMOS area-type image detection array 35 for detectingimaged light reflected off the object during illumination and imageacquisition/capture operations, and generating 2D digital images ofobjects in the FOV, having high-resolution pixel content.

The primary function of the LED-based illumination subsystem 22 is toproduce a wide-area illumination field 36 from the LED array 23 when anobject is automatically detected within the FOV. Notably, the field ofillumination has a narrow optical-bandwidth and is spatially confinedwithin the FOV of the image formation and detection subsystem 21 duringmodes of illumination and imaging, respectively. This arrangement isdesigned to ensure that only narrow-band illumination transmitted fromthe illumination subsystem 22, and reflected from the illuminatedobject, is ultimately transmitted through a narrow-bandtransmission-type optical filter subsystem 40 within the system andreaches the CMOS area-type image detection array 35 for detection andprocessing, whereas all other components of ambient light collected bythe light collection optics are substantially rejected at the imagedetection array 35, thereby providing improved SNR, thus improving theperformance of the system.

The narrow-band transmission-type optical filter subsystem 40 isrealized by (1) a high-pass (i.e. red-wavelength reflecting) filterelement embodied within or at the imaging window (i.e. opticallytransparent faceplate) 3, and (2) a low-pass filter element mountedeither before the CMOS area-type image detection array 35 or anywhereafter beyond the high-pass filter element, including being realized as adichroic mirror film supported on at least one of the FOV foldingmirrors 74 and 75, shown in FIGS. 2A and 2B.

As shown in FIG. 2B, the linear array of LEDs 23 is aligned with anillumination-focusing lens structure 51 embodied or integrated withinthe upper edge of the imaging window 3. Also, the light transmissionaperture 60 formed in the PC board 8 is spatially aligned within theimaging window 3 formed in the front housing portion 2A. The function ofillumination-focusing lens structure 51 is to focus illumination fromthe single linear array of LEDs 23, and to uniformly illuminate objectslocated anywhere within the working distance of the FOV of the system.

As shown in FIG. 2B, an optically-opaque light ray containing structure133 is mounted to the front surface of the PC board 8, about the lineararray of LEDs 23. The function of the optically-opaque light raycontaining structure 133 is to prevent transmission of light rays fromthe LEDs to any surface other than the rear input surface of theillumination-focusing lens panel 3, which uniformly illuminates theentire FOV of the system over its working range. When the front and rearhousing panels 2B and 2A are joined together, with the PC board 8disposed therebetween, the illumination-focusing lens panel 3 sitswithin slanted cut-aways formed in the top surface of the side panels,and illumination rays produced from the linear array of LEDs 23 areeither directed through the rear surface of the illumination-focusinglens panel 3 or absorbed by the black colored interior surface of thestructure 133.

As shown in FIGS. 2A and 2B the optical component support (OCS) assembly78 comprises: a first inclined panel for supporting the FOV foldingmirror above the FOV forming optics, and a second inclined panel forsupporting the second FOV folding mirror above the light transmissionaperture 60. With this arrangement, the FOV employed in the imageformation and detection subsystem 21, and originating from opticssupported on the rear side of the PC board 8, is folded twice, in space,and then projected through the light transmission aperture and out ofthe imaging window of the system.

The automatic light exposure measurement and illumination controlsubsystem 24 performs two primary functions: (1) to measure, inreal-time, the power density [joules/cm] of photonic energy (i.e. light)collected by the optics of the system at about its image detection array35, and to generate auto-exposure control signals indicating the amountof exposure required for good image formation and detection; and (2) incombination with the illumination array selection control signalprovided by the system control subsystem 30, to automatically drive andcontrol the output power of the LED array 23 in the illuminationsubsystem 22, so that objects within the FOV of the system are optimallyexposed to LED-based illumination and optimal images are formed anddetected at the image detection array 35. The OCS assembly 78 alsocomprises a third support panel for supporting the parabolic lightcollection mirror segment 79 employed in the automatic exposuremeasurement and illumination control subsystem 24. Using this mirror 78,a narrow light collecting FOV is projected out into a central portion ofthe wide-area FOV 33 of the image formation and detection subsystem 21and focuses collected light onto photo-detector, which is operatedindependently from the area-type image sensing array 35.

The primary function of the image capturing and buffering subsystem 25is (i) to detect the entire 2-D image focused onto the 2D imagedetection array 35 by the image formation optics 34 of the system, (ii)to generate a frame of digital pixel data for either a selected regionof interest of the captured image frame, or for the entire detectedimage, and then (iii) to buffer each frame of image data as it iscaptured. Notably, in the illustrative embodiment, the system has bothsingle-shot and video modes of imaging. In the single shot mode, asingle 2D image frame is captured during each image capture andprocessing cycle, or during a particular stage of a processing cycle. Inthe video mode of imaging, the system continuously captures frames ofdigital images of objects in the FOV. These modes are specified infurther detail in US Patent Application Publication No. US20080314985A1, incorporated herein by reference in its entirety.

The primary function of the digital image processing subsystem 26 is toprocess digital images that have been captured and buffered by the imagecapturing and buffering subsystem 25, during modes of illumination andoperation. Such image processing operations include image-based bar codedecoding methods as described in U.S. Pat. No. 7,128,266, incorporatedherein by reference.

The primary function of the EAS-enabling faceplate bezel 400 is toincorporate (e.g. embody) primary subcomponents (e.g. coils 28B, 28D andcircuit 28F) of the EAS subsystem 28, which is disposed external to thesystem housing, and quickly equip the digital imaging bar code readingsystem with EAS tag deactivation (and possibly detecting) capabilities.This is achieved by simply mounting the EAS-enabling faceplate bezel 400about the imaging window 3, routing the EAS cable 402 back to the hostcomputing system 91, along with the scanner/reader interface cable 10.

In FIG. 3, the primary components of the EAS subsystem 28 are shown ascomprising: a deactivation coil 28A for generating a EAS tagdeactivation field and a detection coil 28B for generating a EAS tagdetection field, both within a 3D EAS tag detection/deactivation zone28F that spatially encompasses the 3D imaging volume 450 of the bar codesymbol reading system, as shown in FIG. 1; and a EAS signal supply andprocessing unit or module 404 containing a discharge switch 28B, a powergeneration circuit 28C and a EAS tag detection circuit, in a compactmanner, and supporting (i) a first interface with the host computingsystem 91 realized using a flexible EAS cable 403, and (ii) a secondinterface with the deactivation coil 28A and the detection coil 28D,embedded within the EAS-enabling faceplate bezel structure 400, andrealized using a flexible EAS cable 402 extending between the baseportion 401 of the EAS-enabling faceplate bezel structure 400 and thehost computing system 91.

The EAS signal supply and processing module 404 further comprises astandard AC power input and power supply circuitry well known in theart. During operation, the power generation circuit 28C supplies thedeactivation coil 28A with electrical current through the dischargeswitch 28C, which is controlled by the host computer system in aconventional manner. The EAS tag detection/reading circuit 28E processeselectrical signals detected by the EAS detection coil 28D, and generatesdata signals indicative of the detected EAS tag in the EASdetection/deactivation zone 28H.

The primary function of the EAS tag detection field is to automaticallyread EAS tags applied to priced product items, when such product itemsare passed through the 3D EAS tag reading/deactivation zone. The primaryfunction of the EAS tag deactivation field is to automaticallydeactivate EAS tags applied to purchased product items, when suchpurchased items are passed through the 3D EAS tag reading/deactivationzone 28H.

The primary function of the input/output subsystem 27 is to supportuniversal, standard and/or proprietary data communication interfaceswith host system 91, and output processed image data and the like tosuch external host systems or devices by way of such interfaces.Examples of such interfaces, and technology for implementing the same,are given in U.S. Pat. No. 6,619,549, incorporated herein by referencein its entirety.

The primary function of the system control subsystem 30 is to providesome predetermined degree of control, coordination and/or managementsignaling services to each subsystem component integrated within thesystem, as shown. While this subsystem can be implemented by aprogrammed microprocessor, in the preferred embodiments of the presentdisclosure, this subsystem is implemented by the three-tier softwarearchitecture supported on micro-computing platform shown in FIGS. 3, anddescribed in U.S. Pat. No. 7,128,266, and elsewhere hereinafter.

The primary function of the manually-activatable trigger switch 5Aintegrated with the housing is to enable the user, during amanually-triggered mode of operation, to generate a control activationsignal (i.e. trigger event signal) upon manually depressing the same(i.e. causing a trigger event), and to provide this control activationsignal to the system control subsystem 30 for use in carrying out itscomplex system and subsystem control operations, described in detailherein.

The primary function of the system configuration parameter (SCP) table29A in system memory is to store (in non-volatile/persistent memory) aset of system configuration and control parameters (i.e. SCPs) for eachof the available features and functionalities, and programmable modes ofsupported system operation, and which can be automatically read and usedby the system control subsystem 30 as required during its complexoperations. Notably, such SCPs can be dynamically managed as taught ingreat detail in co-pending US Patent No. US20080314985 A1, incorporatedherein by reference.

Second Illustrative Embodiment of the EAS-Enabled Bar Code SymbolReading System

FIG. 6A shows a hand-supportable/countertop-supportable laser-scanningbar code symbol reading system 100 supporting an ultra-thin EAS-enablingbezel faceplate 500 realized as a custom-designed flexible printedcircuit (PC) formed on a flexible substrate, applied about the laserscanning window of the system. The bar code symbol reading system 100 isinterfaced with a POS host computer 91 by way of flexible scannerinterface and EAS cables 402 and 403, respectively. As shown, the POShost computer 91 is interfaced with a retail RDBMS server 333 storingdatabase records on all consumer products offered for sale in the retailenvironment, including product prices and other types of product-relatedinformation.

FIG. 6B shows the EAS-enabling bezel faceplate 500 being applied to thefront surface of the laser-scanning bar code symbol reading system asshown in FIG. 6A. Preferably, a suitable adhesive is applied to theperimeter regions of the rear surface of the flexible EAS-enablingfaceplate bezel 500, and then the faceplate bezel is applied to thesurface of the housing about the faceplate (i.e. laser scanning window).Suitable pressure is applied to the faceplate bezel to ensure strongbonding between the applied adhesive, the faceplate bezel and the frontsurface of the housing about the laser scanning window.

FIG. 7 shows the rear surface of the second illustrative embodiment ofthe EAS-enabling bezel faceplate 500. As shown, the EAS tag deactivationand detection coils 28B′, 28D′ and a cable interface circuit 28F′ arerealized in the rear surface of the flexible printed circuit (PC)substrate, which is molded to the front surface counter of the systemhousing 2B about its laser scanning window (i.e. faceplate).

As shown in FIG. 8, the laser-scanner code symbol reading subsystem 100comprises: a hand-supportable housing 2 (2A, 2B) having a lighttransmission window covered by an optically transparent window orfaceplate 3, and a base portion capable of being supported on acountertop surface; a laser scanning engine (i.e. subsystem) 150 andarray of pattern forming mirrors, disposed in the housing, forgenerating and projecting a complex of laser scanning planes through thelight transmission window, and into the 3D scanning volume 460 of thesubsystem, defined externally with respect to the light transmissionwindow; a scan data processing subsystem 120 for supporting automaticprocessing of scan data collected from each laser scanning plane in thesystem; an input/output subsystem 125 for interfacing with the imageprocessing subsystem; a control subsystem 137; an electronic articlesurveillance (EAS) subsystem 28′, disposed completely outside of thesystem housing, for generating an EAS tag deactivation field and EAS tagreading/detecting field, under the control of the PC host computer 91;ultra-thin EAS-enabling faceplate bezel 500, supporting antenna coils28B′, 28D′ and cable interface circuit 28F′ on the flexible PCsubstrate, and having an base portion that allows a flexible EAS cable402 to pass beneath the system and piggy-back onto the scanner cableassembly 10 provided in the lower rear portion of the bar code symbolreader, and interfaces to module 404, as shown; a system memory 129 forstoring data implementing system configuration parameters (SCPs) and thelike; and an audible/visual information display subsystem (i.e. module)300 for visually and/or audibly displaying various types of indicationsto the system operator carrying out scanning and checkout operations.

The primary function of the laser scanning subsystem 150 is (i) to scancode symbols on objects using laser beams, (ii) collect light reflectedoff the scanned code symbols, and (iii) generate scan datarepresentative of the scanned code symbol.

The primary function of the scan data processing subsystem 120 is toprocess scan data and generate symbol character data of read orrecognized code symbols.

The primary function of the input/output subsystem 127 is to supportuniversal, standard and/or proprietary data communication interfaceswith host system 91. Examples of such interfaces, and technology forimplementing the same, are given in U.S. Pat. No. 6,619,549,incorporated herein by reference in its entirety.

The primary function of the manually-activatable trigger switch 5Aintegrated with the housing is to enable the user, during amanually-triggered mode of operation, to generate a control activationsignal (i.e. trigger event signal) upon manually depressing the same(i.e. causing a trigger event), and to provide this control activationsignal to the system control subsystem 137 for use in carrying out itscomplex system and subsystem control operations, described in detailherein.

The primary function of the system configuration parameter (SCP) tablein system memory 129 is to store (in non-volatile/persistent memory) aset of system configuration and control parameters (i.e. SCCPs) for eachof the available features and functionalities, and programmable modes ofsupported system operation, and which can be automatically read and usedby the system control subsystem 137 as required during its complexoperations. Notably, such SCPs can be dynamically managed as taught ingreat detail in co-pending US Patent No. US20080314985 A1, incorporatedherein by reference.

The primary function of control subsystem 137 is to orchestrate thevarious subsystems in the system 100, and also process data inputs anddetermine that each bar-coded product scanned at the POS checkoutstation has been successfully purchased (i.e. paid for) and controllingthe deactivation of any EAS tags applied to purchased products, and thelike. While this subsystem can be implemented by a programmedmicroprocessor, in the preferred embodiments of the present invention,this subsystem is implemented by the three-tier software architecturesupported on micro-computing platform, as described in U.S. Pat. No.7,128,266, and elsewhere hereinafter.

In FIG. 8, the primary components of the EAS subsystem 28′ are shown ascomprising: a deactivation coil 28A′ for generating a EAS tagdeactivation field and a detection coil 28D′ for generating a EAS tagdetection field, both within a 3D EAS tag detection/deactivation zone128H that spatially encompasses the 3D scanning volume 460 of the barcode symbol reading system; and the EAS signal supply and processingunit or module 404, shown in FIG. 4B, containing a discharge switch 28B,a power generation circuit 28C and a EAS tag detection circuit, 28E. Asshown, module 404 also supports (i) a first interface connecting thedeactivation coil 28A′ and the detection coil 28D′ (formed on theEAS-enabling faceplate bezel structure 500) by flexible EAS cable 402,and (ii) a second interface connecting to the host computing system 91by flexible EAS cable 403, as shown in FIG. 6A.

The primary function of the EAS tag detection field is to automaticallyread EAS tags applied to priced product items, when such product itemsare passed through the 3D EAS tag reading/deactivation zone 460. Theprimary function of the EAS tag deactivation field is to automaticallydeactivate EAS tags applied to purchased product items, when suchpurchased items are passed through the 3D EAS tag reading/deactivationzone 28H during deactivation operations. The primary function of the EAStag detecting field is to automatically detect EAS tags applied toproduct items as passed through the 3D EAS tag reading/deactivation zone28H during detection operations.

Modifications that Come to Mind

The illustrative embodiments described above have shown severaldifferent classes of bar code symbol reading systems employingEAS-enabling faceplate bezel structures of various types, includingultra-thin applique-type face-bezel designs shown in FIGS. 6A through 8,where the flexible EAS cable 402 is shown running beneath the systemhousing 2A, 2B along the course of the flexible scanner interface cable10 and terminating at the EAS controller 404, which can be locatedanywhere at the POS station. It is understood that flexible EAS cable402 can run downward through an aperture formed in the countertopsurface, to the EAS controller 404 located under the countertop of thePOS station, instead of being routed along the scanner interface cable10.

It is understood that the EAS cable 402 can be alternatively realized asa thin flexible printed circuit (PC) cable extending from the baseportion 502 of the EAS-enabling faceplate bezel 500 to the EAScontroller 404 located beneath the POS countertop, near the hostcomputer system 91, or elsewhere at the POS station. This thin flexibleEAS cable also can be run downward through an aperture formed in thecountertop surface, to the EAS controller 404 located under thecountertop of the POS station, instead of being routed along the scannerinterface cable 10.

In alternative embodiments, the bar code symbol reading system can beprovided with a wireless data communication interface to the POS hostcomputer 91, by replacing the scanner interface cable 10 with a wirelessdata communication interface link, well known in the art. In suchinstances, the flexible EAS cable, however realized, can be routed toits EAS controller 404, wherever it might be installed at the POSstation.

Several modifications to the illustrative embodiments have beendescribed above. It is understood, however, that various othermodifications to the illustrative embodiment will readily occur topersons with ordinary skill in the art. All such modifications andvariations are deemed to be within the scope of the accompanying Claims.

The invention claimed is:
 1. A symbol reading system, comprising: anoptically transparent faceplate; a symbol reading subsystem for readingsymbols passed in front of the optically transparent faceplate; anelectrical interface circuit; a first wire coil having two endsconnected to the electrical interface circuit; and a faceplate bezelhaving a front surface, a rear surface, and an aperture havingdimensions similar to the optically transparent faceplate's outerdimensions, wherein the faceplate bezel's rear surface forms a grooveextending around the faceplate bezel's aperture at a depth sufficient torecess the first wire coil.
 2. The symbol reading system of claim 1,comprising a second wire coil having two ends connected to theelectrical interface circuit, wherein the groove extending around thefaceplate bezel's aperture has a depth sufficient to recess the firstwire coil and the second wire coil.
 3. The symbol reading system ofclaim 1, comprising a power circuit for generating an electrical signalto the first wire coil.
 4. The symbol reading system of claim 1,comprising an electronic article surveillance cable connected to theelectrical interface circuit.
 5. The symbol reading system of claim 1,wherein: the faceplate bezel comprises a base portion having a recessedcavity; and the electrical interface circuit is mounted within therecessed cavity.
 6. The symbol reading system of claim 1, wherein thesymbol reading subsystem comprises a laser scanning symbol reader. 7.The symbol reading system of claim 1, wherein the symbol readingsubsystem comprises a digital-imaging symbol reader.
 8. The symbolreading system of claim 1, comprising a housing, wherein: the opticallytransparent faceplate and symbol reading system are disposed within thehousing; and the faceplate bezel is mounted on the housing.
 9. A symbolreading system, comprising: an optically transparent faceplate; a symbolreading subsystem for reading symbols passed in front of the opticallytransparent faceplate; a faceplate bezel formed of a flexible substratehaving a front surface, a rear surface, and an aperture havingdimensions similar to the optically transparent faceplate's outerdimensions; an electrical interface circuit; a first wire coil on thefaceplate bezel's rear surface and having two ends connected to theelectrical interface circuit; and wherein the faceplate bezel's rearsurface forms a groove extending around the faceplate bezel's apertureat a depth sufficient to recess the first wire coil.
 10. The symbolreading system of claim 9, comprising a second wire coil on thefaceplate bezel's rear surface and having two ends connected to theelectrical interface circuit.
 11. The symbol reading system of claim 9,comprising a power circuit for generating an electrical signal to thefirst wire coil.
 12. The symbol reading system of claim 9, comprising anelectronic article surveillance cable connected to the electricalinterface circuit.
 13. The symbol reading system of claim 9, wherein:the faceplate bezel comprises a base portion having a rear surface; andthe electrical interface circuit is mounted on the base portion's rearsurface.
 14. The symbol reading system of claim 9, wherein the symbolreading subsystem comprises a laser scanning symbol reader.
 15. Thesymbol reading system of claim 9, wherein the symbol reading subsystemcomprises a digital-imaging symbol reader.
 16. The symbol reading systemof claim 9, comprising a housing, wherein: the optically transparentfaceplate and symbol reading system are disposed within the housing; andthe faceplate bezel is mounted on the housing.
 17. A faceplate bezel formounting on a symbol reading system, comprising: an electrical interfacecircuit; a front surface and a rear surface forming an aperture; and afirst wire coil on the faceplate bezel's rear surface and having twoends connected to the electrical interface circuit; wherein thefaceplate bezel is formed of a flexible substrate; and wherein thefaceplate bezel's rear surface forms a groove extending around thefaceplate bezel's aperture at a depth sufficient to recess the firstwire coil.
 18. The faceplate bezel of claim 17, wherein: the faceplatebezel comprises a base portion having a rear surface; and the electricalinterface circuit is mounted on the base portion's rear surface.
 19. Asymbol reading system comprising the faceplate bezel of claim 17 and apower circuit for generating an electrical signal to the first wirecoil.
 20. A symbol reading system comprising the faceplate bezel ofclaim 17 and an electronic article surveillance cable connected to theelectrical interface circuit.